单项选择题

The writer considers that the Bronze Age succeeded the Stone Age because

A．there was a scarcity of wood and other building materials
B．bronze was less expensive than stone
C．stone was no longer available
D．more bronze than stone came into use

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热门试题

单项选择题

The writer regards the change to a Plastic and Light Metal Age in the near future as _________.

A．necessary
B．desirable
C．improbable
D．logical

单项选择题

The title that best expresses the idea of this passage is _________.

A．New Uses for Plastics
B．How One Age Succeeds Another.
C．Advantages of Plastics
D．Limitations on the Use of Plastics